Whenever we enable/disable disk encryption, we are deleting all the cached data.

1.Why are we deleting all the DRE cache, when we enable/disable disk encryption? Instead we should encrypt/decrypt the data with the key that we got from CM. If we delete all the DRE cache, then we will lose the compression that we got from the DRE cache.

2.How can I verify that the files in the disk are encrypted, after disk encryption is enabled?

If I am encrypting an existing (unencrypted) partition, I have to write the encrypted version of the partition somewhere on disk before I remove the unencrypted version. Likewise in reverse. We don't have the disk space to perform this operation.